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12v to 15v DC

Discussion in 'Electronic Basics' started by Colin Dawson, May 15, 2005.

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  1. Colin Dawson

    Colin Dawson Guest

    Hi all.

    I'm looking at making a very simple circuit that will take an input from a
    car battery, then convert the output to 15v, the circuit will need to
    provide 2A maximum. (it's to power my telescope)

    Basically, I'm looking to accomplish this with as few components as
    possible. Does anyone have a circuit diagram that will do this? If not
    can someone point me in the right direction?


    Colin Dawson
  2. Bob Monsen

    Bob Monsen Guest

    You can buy converters that will generate 120VAC from a 12V battery.
    These are called inverters. Here is one that will work:

    Just plug the wall wart from the telescope into it.
  3. Rich Webb

    Rich Webb Guest

    Check out
  4. Ken

    Ken Guest
  5. Ken

    Ken Guest
  6. Colin Dawson

    Colin Dawson Guest

    Thanks for the suggestions.

    After looking at the ideas that you've shown me. I've come up with another
    solution.. I'm surprised that I didn't think of it before... I've got a
    12v laptop power supply that's quite small. If I can get hold of another
    one, could rip the circuit out of it and use that.

    For the cost it'll be cheaper to do this than to build a circuit from


    Colin Dawson
  7. <snippety>

    "Simple circuit" and doing what you describe do not go together in
    the same sentence. You're talking about DC-DC conversion, something that
    involves a fair number of components and good design skills.

    That's the bad news. The good news is that there are ready-
    manufactured DC-DC converters available that will do exactly as you

    Based on your stated requirements, you can go a couple of
    different ways. Mean Well Electronics, part #SDM30-12S15, has an input
    rating of 9-18V, output of 15V at 1.7A, 80% efficiency. It'll probably
    run you about USD $35 or so.

    As a point of interest, I use this same module in one of my own
    applications. It has proven to be very reliable.

    For the ultimate in quality and reliability, go with Datel, their
    part #UHE-15/2000-D12. Average price seems to be about USD $60. It's
    available from Allied Electronics or Newark (the latter known in the UK
    as Farnell).

    Whatever you decide on, you'll need a 30 watt unit with 9-18V
    input rating.

    Happy hunting.

    Dr. Anton T. Squeegee, Director, Dutch Surrealist Plumbing Institute.
    (Known to some as Bruce Lane, ARS KC7GR,
    kyrrin (a/t) bluefeathertech[d=o=t]calm --
    "If Salvador Dali had owned a computer, would it have been equipped
    with surreal ports?"
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